1
IIT-JEE 2012 Paper 1 Offline
Numerical
+3
-0

The substituents R1 and R2 for nine peptides are listed in the table given below. How many of these peptides are positively charged at pH = 7.0 ?

IIT-JEE 2012 Paper 1 Offline Chemistry - Biomolecules Question 7 English

Peptide $${R_1}$$ $${R_2}$$
I H H
II H $$C{H_3}$$
III $$C{H_2}COOH$$ H
IV $$C{H_2}CON{H_2}$$ $${(C{H_2})_4}N{H_2}$$
V $$C{H_2}CON{H_2}$$ $$C{H_2}CON{H_2}$$
VI $${(C{H_2})_4}N{H_2}$$ $${(C{H_2})_4}N{H_2}$$
VII $$C{H_2}COOH$$ $$C{H_2}CON{H_2}$$
VIII $$C{H_2}OH$$ $${(C{H_2})_4}N{H_2}$$
IX $${(C{H_2})_4}N{H_2}$$ $$C{H_3}$$

Your input ____
2
IIT-JEE 2012 Paper 1 Offline
Numerical
+3
-0

When the following aldohexose exists in its D-configuration, the total number of stereoisomers in its pyranose form is ____________.

IIT-JEE 2012 Paper 1 Offline Chemistry - Basics of Organic Chemistry Question 17 English

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3
IIT-JEE 2012 Paper 1 Offline
MCQ (Single Correct Answer)
+4
-1
Let z be a complex number such that the imaginary part of z is non-zero and $$a\, = \,{z^2} + \,z\, + 1$$ is real. Then a cannot take the value
A
- 1
B
$${1 \over 3}$$
C
$${1 \over 2}$$
D
$${3 \over 4}$$
4
IIT-JEE 2012 Paper 1 Offline
MCQ (More than One Correct Answer)
+4
-1
Let $$\theta ,\,\varphi \, \in \,\left[ {0,2\pi } \right]$$ be such that
$$2\cos \theta \left( {1 - \sin \,\varphi } \right) = {\sin ^2}\theta \,\,\left( {\tan {\theta \over 2} + \cot {\theta \over 2}} \right)\cos \varphi - 1,\,\tan \left( {2\pi - \theta } \right) > 0$$ and $$ - 1 < \sin \theta \, < - {{\sqrt 3 } \over 2},$$

then $$\varphi $$ cannot satisfy

A
$$0 < \varphi < {\pi \over 2}$$
B
$${\pi \over 2} < \varphi < {{4\pi } \over 3}$$
C
$${{4\pi } \over 3} < \varphi < {{3\pi } \over 2}$$
D
$${{3\pi } \over 2} < \varphi < 2\pi $$
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